The Determination of Plutonium in Soil Samples

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Abstract
The contents of plutonium-239 in soil were determined by using 238Pu as yield tracer. The samples were decomposed by nitric acid treatment under ultrasonic vibration and the separation of plutonium from other elements was carried out by using anion exchange resin. The surface soils showed the plutonium content of about 1∼4 mCi/km2 and their 239Pu/90Sr activity ratios were 2∼5%. From these results, it was concluded that 239Pu in soil at present was brought mainly by the fall-out due to the nuclear bomb test explosion.

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